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1. Two Sum

Easy
13. Roman to Integer

Easy
359. Logger Rate Limiter

Easy
4. Median of Two Sorted Arrays

Hard
42. Trapping Rain Water

Hard
88. Merge Sorted Array

Easy
2667. Create Hello World Function

Easy
20. Valid Parentheses

Easy
200. Number of Islands

Med.
2. Add Two Numbers

Med.
2402. Meeting Rooms III

Hard
56. Merge Intervals

Med.
128. Longest Consecutive Sequence

Med.
9. Palindrome Number

Easy
14. Longest Common Prefix

Easy
15. 3Sum

Med.
5. Longest Palindromic Substring

Med.
7. Reverse Integer

Med.
11. Container With Most Water

Med.
121. Best Time to Buy and Sell Stock

Easy
70. Climbing Stairs

Easy
3. Longest Substring Without Repeating Characters

Med.
1207. Unique Number of Occurrences

Easy
1768. Merge Strings Alternately

Easy
2101. Detonate the Maximum Bombs

Med.
1110. Delete Nodes And Return Forest

Med.
1757. Recyclable and Low Fat Products

Easy
146. LRU Cache

Med.
715. Range Module

Hard
410. Split Array Largest Sum

Hard
17. Letter Combinations of a Phone Number

Med.
22. Generate Parentheses

Med.
33. Search in Rotated Sorted Array

Med.
253. Meeting Rooms II

Med.
875. Koko Eating Bananas

Med.
939. Minimum Area Rectangle

Med.
2458. Height of Binary Tree After Subtree Removal Queries

Hard
62. Unique Paths

Med.
48. Rotate Image

Med.
202. Happy Number

Easy
424. Longest Repeating Character Replacement

Med.
26. Remove Duplicates from Sorted Array

Easy
31. Next Permutation

Med.
85. Maximal Rectangle

Hard
198. House Robber

Med.
239. Sliding Window Maximum

Hard
1101. The Earliest Moment When Everyone Become Friends

Med.
53. Maximum Subarray

Med.
169. Majority Element

Easy
295. Find Median from Data Stream

Hard
818. Race Car

Hard
57. Insert Interval

Med.
2013. Detect Squares

Med.
21. Merge Two Sorted Lists

Easy
215. Kth Largest Element in an Array

Med.
975. Odd Even Jump

Hard
1254. Number of Closed Islands

Med.
1825. Finding MK Average

Hard
1136. Parallel Courses

Med.
2235. Add Two Integers

Easy
54. Spiral Matrix

Med.
68. Text Justification

Hard
560. Subarray Sum Equals K

Med.
528. Random Pick with Weight

Med.
23. Merge k Sorted Lists

Hard
207. Course Schedule

Med.
217. Contains Duplicate

Easy
394. Decode String

Med.
1293. Shortest Path in a Grid with Obstacles Elimination

Hard
50. Pow(x, n)

Med.
84. Largest Rectangle in Histogram

Hard
1480. Running Sum of 1d Array

Easy
18. 4Sum

Med.
49. Group Anagrams

Med.
417. Pacific Atlantic Water Flow

Med.
27. Remove Element

Easy
189. Rotate Array

Med.
322. Coin Change

Med.
162. Find Peak Element

Med.
1146. Snapshot Array

Med.
45. Jump Game II

Med.
226. Invert Binary Tree

Easy
300. Longest Increasing Subsequence

Med.
380. Insert Delete GetRandom O(1)

Med.
843. Guess the Word

Hard
1509. Minimum Difference Between Largest and Smallest Value in Three Moves

Med.
41. First Missing Positive

Hard
66. Plus One

Easy
485. Max Consecutive Ones

Easy
329. Longest Increasing Path in a Matrix

Hard
489. Robot Room Cleaner

Hard
10. Regular Expression Matching

Hard
55. Jump Game

Med.
208. Implement Trie (Prefix Tree)

Med.
234. Palindrome Linked List

Easy
2034. Stock Price Fluctuation

Med.
35. Search Insert Position

Easy
39. Combination Sum

Med.
136. Single Number

Easy
206. Reverse Linked List

Easy
210. Course Schedule II

Med.
37. Sudoku Solver

Hard
118. Pascal's Triangle

Easy
139. Word Break

Med.
283. Move Zeroes

Easy
1376. Time Needed to Inform All Employees

Med.
1834. Single-Threaded CPU

Med.
78. Subsets

Med.
79. Word Search

Med.
238. Product of Array Except Self

Med.
274. H-Index

Med.
287. Find the Duplicate Number

Med.
346. Moving Average from Data Stream

Easy
542. 01 Matrix

Med.
595. Big Countries

Easy
729. My Calendar I

Med.
2115. Find All Possible Recipes from Given Supplies

Med.
28. Find the Index of the First Occurrence in a String

Easy
34. Find First and Last Position of Element in Sorted Array

Med.
448. Find All Numbers Disappeared in an Array

Easy
852. Peak Index in a Mountain Array

Med.
959. Regions Cut By Slashes

Med.
1482. Minimum Number of Days to Make m Bouquets

Med.
51. N-Queens

Hard
69. Sqrt(x)

Easy
409. Longest Palindrome

Easy
2713. Maximum Strictly Increasing Cells in a Matrix

Hard
67. Add Binary

Easy
143. Reorder List

Med.
231. Power of Two

Easy
312. Burst Balloons

Hard
315. Count of Smaller Numbers After Self

Hard
540. Single Element in a Sorted Array

Med.
904. Fruit Into Baskets

Med.
1004. Max Consecutive Ones III

Med.
1105. Filling Bookcase Shelves

Med.
2407. Longest Increasing Subsequence II

Hard
19. Remove Nth Node From End of List

Med.
25. Reverse Nodes in k-Group

Hard
44. Wildcard Matching

Hard
74. Search a 2D Matrix

Med.
104. Maximum Depth of Binary Tree

Easy
212. Word Search II

Hard
224. Basic Calculator

Hard
282. Expression Add Operators

Hard
345. Reverse Vowels of a String

Easy
347. Top K Frequent Elements

Med.
368. Largest Divisible Subset

Med.
402. Remove K Digits

Med.
416. Partition Equal Subset Sum

Med.
459. Repeated Substring Pattern

Easy
652. Find Duplicate Subtrees

Med.
704. Binary Search

Easy
46. Permutations

Med.
73. Set Matrix Zeroes

Med.
131. Palindrome Partitioning

Med.
366. Find Leaves of Binary Tree

Med.
460. LFU Cache

Hard
494. Target Sum

Med.
543. Diameter of Binary Tree

Easy
739. Daily Temperatures

Med.
808. Soup Servings

Med.
832. Flipping an Image

Easy
834. Sum of Distances in Tree

Hard
1007. Minimum Domino Rotations For Equal Row

Med.
1020. Number of Enclaves

Med.
2421. Number of Good Paths

Hard
72. Edit Distance

Med.
75. Sort Colors

Med.
125. Valid Palindrome

Easy
127. Word Ladder

Hard
242. Valid Anagram

Easy
279. Perfect Squares

Med.
332. Reconstruct Itinerary

Hard
344. Reverse String

Easy
387. First Unique Character in a String

Easy
399. Evaluate Division

Med.
418. Sentence Screen Fitting

Med.
463. Island Perimeter

Easy
486. Predict the Winner

Med.
493. Reverse Pairs

Hard
733. Flood Fill

Easy
833. Find And Replace in String

Med.
963. Minimum Area Rectangle II

Med.
1218. Longest Arithmetic Subsequence of Given Difference

Med.
1631. Path With Minimum Effort

Med.
1672. Richest Customer Wealth

Easy
2332. The Latest Time to Catch a Bus

Med.
2437. Number of Valid Clock Times

Easy
2812. Find the Safest Path in a Grid

Med.
124. Binary Tree Maximum Path Sum

Hard
140. Word Break II

Hard
150. Evaluate Reverse Polish Notation

Med.
155. Min Stack

Med.
228. Summary Ranges

Easy
362. Design Hit Counter

Med.
389. Find the Difference

Easy
844. Backspace String Compare

Easy
900. RLE Iterator

Med.
1011. Capacity To Ship Packages Within D Days

Med.
2025. Maximum Number of Ways to Partition an Array

Hard
2265. Count Nodes Equal to Average of Subtree

Med.
2316. Count Unreachable Pairs of Nodes in an Undirected Graph

Med.
2416. Sum of Prefix Scores of Strings

Hard
2863. Maximum Length of Semi-Decreasing Subarrays

Med.
6. Zigzag Conversion

Med.
8. String to Integer (atoi)

Med.
133. Clone Graph

Med.
349. Intersection of Two Arrays

Easy
388. Longest Absolute File Path

Med.
392. Is Subsequence

Easy
584. Find Customer Referee

Easy
853. Car Fleet

Med.
857. Minimum Cost to Hire K Workers

Hard
876. Middle of the Linked List

Easy
509. Fibonacci Number

Easy
981. Time Based Key-Value Store

Med.
2018. Check if Word Can Be Placed In Crossword

Med.
76. Minimum Window Substring

Hard
100. Same Tree

Easy
134. Gas Station

Med.
135. Candy

Hard
151. Reverse Words in a String

Med.
240. Search a 2D Matrix II

Med.
269. Alien Dictionary

Hard
310. Minimum Height Trees

Med.
354. Russian Doll Envelopes

Hard
373. Find K Pairs with Smallest Sums

Med.
412. Fizz Buzz

Easy
451. Sort Characters By Frequency

Med.
643. Maximum Average Subarray I

Easy
679. 24 Game

Hard
778. Swim in Rising Water

Hard
934. Shortest Bridge

Med.
1368. Minimum Cost to Make at Least One Valid Path in a Grid

Hard
1377. Frog Position After T Seconds

Hard
1547. Minimum Cost to Cut a Stick

Hard
1642. Furthest Building You Can Reach

Med.
1937. Maximum Number of Points with Cost

Med.
2007. Find Original Array From Doubled Array

Med.
2842. Count K-Subsequences of a String With Maximum Beauty

Hard
205. Isomorphic Strings

Easy
218. The Skyline Problem

Hard
221. Maximal Square

Med.
229. Majority Element II

Med.
330. Patching Array

Hard
365. Water and Jug Problem

Med.
503. Next Greater Element II

Med.
685. Redundant Connection II

Hard
759. Employee Free Time

Hard
777. Swap Adjacent in LR String

Med.
790. Domino and Tromino Tiling

Med.
938. Range Sum of BST

Easy
947. Most Stones Removed with Same Row or Column

Med.
948. Bag of Tokens

Med.
994. Rotting Oranges

Med.
1219. Path with Maximum Gold

Med.
2215. Find the Difference of Two Arrays

Easy
1277. Count Square Submatrices with All Ones

Med.
1463. Cherry Pickup II

Hard
1851. Minimum Interval to Include Each Query

Hard
2251. Number of Flowers in Full Bloom

Hard
2435. Paths in Matrix Whose Sum Is Divisible by K

Hard
2877. Create a DataFrame from List

Easy
32. Longest Valid Parentheses

Hard
58. Length of Last Word

Easy
94. Binary Tree Inorder Traversal

Easy
122. Best Time to Buy and Sell Stock II

Med.
138. Copy List with Random Pointer

Med.
230. Kth Smallest Element in a BST

Med.
236. Lowest Common Ancestor of a Binary Tree

Med.
261. Graph Valid Tree

Med.
289. Game of Life

Med.
299. Bulls and Cows

Med.
309. Best Time to Buy and Sell Stock with Cooldown

Med.
316. Remove Duplicate Letters

Med.
317. Shortest Distance from All Buildings

Hard
323. Number of Connected Components in an Undirected Graph

Med.
326. Power of Three

Easy
406. Queue Reconstruction by Height

Med.
465. Optimal Account Balancing

Hard
501. Find Mode in Binary Search Tree

Easy
506. Relative Ranks

Easy
552. Student Attendance Record II

Hard
567. Permutation in String

Med.
587. Erect the Fence

Hard
621. Task Scheduler

Med.
658. Find K Closest Elements

Med.
684. Redundant Connection

Med.
726. Number of Atoms

Hard
767. Reorganize String

Med.
792. Number of Matching Subsequences

Med.
802. Find Eventual Safe States

Med.
837. New 21 Game

Med.
847. Shortest Path Visiting All Nodes

Hard
887. Super Egg Drop

Hard
962. Maximum Width Ramp

Med.
979. Distribute Coins in Binary Tree

Med.
1143. Longest Common Subsequence

Med.
1345. Jump Game IV

Hard
1365. How Many Numbers Are Smaller Than the Current Number

Easy
1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit

Med.
1494. Parallel Courses II

Hard
1498. Number of Subsequences That Satisfy the Given Sum Condition

Med.
1592. Rearrange Spaces Between Words

Easy
2096. Step-By-Step Directions From a Binary Tree Node to Another

Med.
2172. Maximum AND Sum of Array

Hard
3110. Score of a String

Easy
36. Valid Sudoku

Med.
63. Unique Paths II

Med.
64. Minimum Path Sum

Med.
137. Single Number II

Med.
141. Linked List Cycle

Easy
153. Find Minimum in Rotated Sorted Array

Med.
197. Rising Temperature

Easy
213. House Robber II

Med.
214. Shortest Palindrome

Hard
247. Strobogrammatic Number II

Med.
273. Integer to English Words

Hard
297. Serialize and Deserialize Binary Tree

Hard
403. Frog Jump

Hard
407. Trapping Rain Water II

Hard
415. Add Strings

Easy
514. Freedom Trail

Hard
681. Next Closest Time

Med.
690. Employee Importance

Med.
859. Buddy Strings

Easy
864. Shortest Path to Get All Keys

Hard
894. All Possible Full Binary Trees

Med.
912. Sort an Array

Med.
1087. Brace Expansion

Med.
1024. Video Stitching

Med.
1168. Optimize Water Distribution in a Village

Hard
1944. Number of Visible People in a Queue

Hard
1296. Divide Array in Sets of K Consecutive Numbers

Med.
1512. Number of Good Pairs

Easy
1608. Special Array With X Elements Greater Than or Equal X

Easy
1630. Arithmetic Subarrays

Med.
1756. Design Most Recently Used Queue

Med.
2088. Count Fertile Pyramids in a Land

Hard
2184. Number of Ways to Build Sturdy Brick Wall

Med.
2331. Evaluate Boolean Binary Tree

Easy
2620. Counter

Easy
71. Simplify Path

Med.
163. Missing Ranges

Easy
173. Binary Search Tree Iterator

Med.
278. First Bad Version

Easy
353. Design Snake Game

Med.
375. Guess Number Higher or Lower II

Med.
377. Combination Sum IV

Med.
379. Design Phone Directory

Med.
382. Linked List Random Node

Med.
393. UTF-8 Validation

Med.
400. Nth Digit

Med.
421. Maximum XOR of Two Numbers in an Array

Med.
475. Heaters

Med.
482. License Key Formatting

Easy
490. The Maze

Med.
541. Reverse String II

Easy
547. Number of Provinces

Med.
721. Accounts Merge

Med.
746. Min Cost Climbing Stairs

Easy
753. Cracking the Safe

Hard
787. Cheapest Flights Within K Stops

Med.
839. Similar String Groups

Hard
841. Keys and Rooms

Med.
909. Snakes and Ladders

Med.
929. Unique Email Addresses

Easy
941. Valid Mountain Array

Easy
942. DI String Match

Easy
1071. Greatest Common Divisor of Strings

Easy
1138. Alphabet Board Path

Med.
1313. Decompress Run-Length Encoded List

Easy
1514. Path with Maximum Probability

Med.
1508. Range Sum of Sorted Subarray Sums

Med.
1525. Number of Good Ways to Split a String

Med.
1557. Minimum Number of Vertices to Reach All Nodes

Med.
1727. Largest Submatrix With Rearrangements

Med.
1770. Maximum Score from Performing Multiplication Operations

Hard
1793. Maximum Score of a Good Subarray

Hard
1857. Largest Color Value in a Directed Graph

Hard
1987. Number of Unique Good Subsequences

Hard
1996. The Number of Weak Characters in the Game

Med.
2290. Minimum Obstacle Removal to Reach Corner

Hard
2373. Largest Local Values in a Matrix

Easy
2762. Continuous Subarrays

Med.
2982. Find Longest Special Substring That Occurs Thrice II

Med.
3196. Maximize Total Cost of Alternating Subarrays

Med.
3235. Check if the Rectangle Corner Is Reachable

Hard
101. Symmetric Tree

Easy
114. Flatten Binary Tree to Linked List

Med.
152. Maximum Product Subarray

Med.
158. Read N Characters Given read4 II - Call Multiple Times

Hard
257. Binary Tree Paths

Easy
266. Palindrome Permutation

Easy
271. Encode and Decode Strings

Med.
286. Walls and Gates

Med.
302. Smallest Rectangle Enclosing Black Pixels

Hard
308. Range Sum Query 2D - Mutable

Hard
314. Binary Tree Vertical Order Traversal

Med.
324. Wiggle Sort II

Med.
336. Palindrome Pairs

Hard
340. Longest Substring with At Most K Distinct Characters

Med.
341. Flatten Nested List Iterator

Med.
374. Guess Number Higher or Lower

Easy
480. Sliding Window Median

Hard
530. Minimum Absolute Difference in BST

Easy
616. Add Bold Tag in String

Med.
686. Repeated String Match

Med.
692. Top K Frequent Words

Med.
766. Toeplitz Matrix

Easy
497. Random Point in Non-overlapping Rectangles

Med.
935. Knight Dialer

Med.
944. Delete Columns to Make Sorted

Easy
987. Vertical Order Traversal of a Binary Tree

Hard
988. Smallest String Starting From Leaf

Med.
1021. Remove Outermost Parentheses

Easy
1032. Stream of Characters

Hard
1197. Minimum Knight Moves

Med.
1089. Duplicate Zeros

Easy
1287. Element Appearing More Than 25% In Sorted Array

Easy
1302. Deepest Leaves Sum

Med.
1235. Maximum Profit in Job Scheduling

Hard
1352. Product of the Last K Numbers

Med.
1406. Stone Game III

Hard
1422. Maximum Score After Splitting a String

Easy
1423. Maximum Points You Can Obtain from Cards

Med.
1424. Diagonal Traverse II

Med.
1441. Build an Array With Stack Operations

Med.
1544. Make The String Great

Easy
1582. Special Positions in a Binary Matrix

Easy
1605. Find Valid Matrix Given Row and Column Sums

Med.
1717. Maximum Score From Removing Substrings

Med.
1838. Frequency of the Most Frequent Element

Med.
1921. Eliminate Maximum Number of Monsters

Med.
1922. Count Good Numbers

Med.
2035. Partition Array Into Two Arrays to Minimize Sum Difference

Hard
2050. Parallel Courses III

Hard
2089. Find Target Indices After Sorting Array

Easy
2092. Find All People With Secret

Hard
2162. Minimum Cost to Set Cooking Time

Med.
2185. Counting Words With a Given Prefix

Easy
2188. Minimum Time to Finish the Race

Hard
2158. Amount of New Area Painted Each Day

Hard
2313. Minimum Flips in Binary Tree to Get Result

Hard
2366. Minimum Replacements to Sort the Array

Hard
2392. Build a Matrix With Conditions

Hard
2345. Finding the Number of Visible Mountains

Med.
2426. Number of Pairs Satisfying Inequality

Hard
2488. Count Subarrays With Median K

Hard
16. 3Sum Closest

Med.
24. Swap Nodes in Pairs

Med.
29. Divide Two Integers

Med.
30. Substring with Concatenation of All Words

Hard
80. Remove Duplicates from Sorted Array II

Med.
92. Reverse Linked List II

Med.
148. Sort List

Med.
149. Max Points on a Line

Hard
166. Fraction to Recurring Decimal

Med.
270. Closest Binary Search Tree Value

Easy
293. Flip Game

Easy
298. Binary Tree Longest Consecutive Sequence

Med.
327. Count of Range Sum

Hard
348. Design Tic-Tac-Toe

Med.
351. Android Unlock Patterns

Med.
357. Count Numbers with Unique Digits

Med.
361. Bomb Enemy

Med.
363. Max Sum of Rectangle No Larger Than K

Hard
378. Kth Smallest Element in a Sorted Matrix

Med.
443. String Compression

Med.
444. Sequence Reconstruction

Med.
447. Number of Boomerangs

Med.
487. Max Consecutive Ones II

Med.
498. Diagonal Traverse

Med.
522. Longest Uncommon Subsequence II

Med.
524. Longest Word in Dictionary through Deleting

Med.
526. Beautiful Arrangement

Med.
549. Binary Tree Longest Consecutive Sequence II

Med.
551. Student Attendance Record I

Easy
604. Design Compressed String Iterator

Easy
651. 4 Keys Keyboard

Med.
659. Split Array into Consecutive Subsequences

Med.
667. Beautiful Arrangement II

Med.
719. Find K-th Smallest Pair Distance

Hard
737. Sentence Similarity II

Med.
743. Network Delay Time

Med.
765. Couples Holding Hands

Hard
779. K-th Symbol in Grammar

Med.
780. Reaching Points

Hard
783. Minimum Distance Between BST Nodes

Easy
815. Bus Routes

Hard
845. Longest Mountain in Array

Med.
849. Maximize Distance to Closest Person

Med.
879. Profitable Schemes

Hard
917. Reverse Only Letters

Easy
926. Flip String to Monotone Increasing

Med.
932. Beautiful Array

Med.
951. Flip Equivalent Binary Trees

Med.
952. Largest Component Size by Common Factor

Hard
960. Delete Columns to Make Sorted III

Hard
1000. Minimum Cost to Merge Stones

Hard
1056. Confusing Number

Easy
1161. Maximum Level Sum of a Binary Tree

Med.
1048. Longest String Chain

Med.
1095. Find in Mountain Array

Hard
1145. Binary Tree Coloring Game

Med.
1147. Longest Chunked Palindrome Decomposition

Hard
1483. Kth Ancestor of a Tree Node

Hard
1233. Remove Sub-Folders from the Filesystem

Med.
1237. Find Positive Integer Solution for a Given Equation

Med.
1240. Tiling a Rectangle with the Fewest Squares

Hard
1249. Minimum Remove to Make Valid Parentheses

Med.
2305. Fair Distribution of Cookies

Med.
2192. All Ancestors of a Node in a Directed Acyclic Graph

Med.
1346. Check If N and Its Double Exist

Easy
1401. Circle and Rectangle Overlapping

Med.
1488. Avoid Flood in The City

Med.
1499. Max Value of Equation

Hard
1503. Last Moment Before All Ants Fall Out of a Plank

Med.
1506. Find Root of N-Ary Tree

Med.
1530. Number of Good Leaf Nodes Pairs

Med.
1569. Number of Ways to Reorder Array to Get Same BST

Hard
1616. Split Two Strings to Make Palindrome

Med.
1697. Checking Existence of Edge Length Limited Paths

Hard
1707. Maximum XOR With an Element From Array

Hard
1781. Sum of Beauty of All Substrings

Med.
1776. Car Fleet II

Hard
1828. Queries on Number of Points Inside a Circle

Med.
1844. Replace All Digits with Characters

Easy
2057. Smallest Index With Equal Value

Easy
2114. Maximum Number of Words Found in Sentences

Easy
2103. Rings and Rods

Easy
2178. Maximum Split of Positive Even Integers

Med.
2260. Minimum Consecutive Cards to Pick Up

Med.
2242. Maximum Score of a Node Sequence

Hard
2271. Maximum White Tiles Covered by a Carpet

Med.
2284. Sender With Largest Word Count

Med.
2302. Count Subarrays With Score Less Than K

Hard
2349. Design a Number Container System

Med.
2478. Number of Beautiful Partitions

Hard
2963. Count the Number of Good Partitions

Hard
2967. Minimum Cost to Make Array Equalindromic

Med.
3041. Maximize Consecutive Elements in an Array After Modification

Hard
3044. Most Frequent Prime

Med.
3201. Find the Maximum Length of Valid Subsequence I

Med.
3202. Find the Maximum Length of Valid Subsequence II

Med.
12. Integer to Roman

Med.
83. Remove Duplicates from Sorted List

Easy
91. Decode Ways

Med.
115. Distinct Subsequences

Hard
142. Linked List Cycle II

Med.
159. Longest Substring with At Most Two Distinct Characters

Med.
168. Excel Sheet Column Title

Easy
204. Count Primes

Med.
209. Minimum Size Subarray Sum

Med.
249. Group Shifted Strings

Med.
259. 3Sum Smaller

Med.
280. Wiggle Sort

Med.
281. Zigzag Iterator

Med.
305. Number of Islands II

Hard
318. Maximum Product of Word Lengths

Med.
321. Create Maximum Number

Hard
337. House Robber III

Med.
356. Line Reflection

Med.
383. Ransom Note

Easy
408. Valid Word Abbreviation

Easy
435. Non-overlapping Intervals

Med.
442. Find All Duplicates in an Array

Med.
469. Convex Polygon

Med.
474. Ones and Zeroes

Med.
505. The Maze II

Med.
520. Detect Capital

Easy
525. Contiguous Array

Med.
539. Minimum Time Difference

Med.
544. Output Contest Matches

Med.
569. Median Employee Salary

Hard
581. Shortest Unsorted Continuous Subarray

Med.
583. Delete Operation for Two Strings

Med.
657. Robot Return to Origin

Easy
662. Maximum Width of Binary Tree

Med.
665. Non-decreasing Array

Med.
727. Minimum Window Subsequence

Hard
732. My Calendar III

Hard
734. Sentence Similarity

Easy
747. Largest Number At Least Twice of Others

Easy
782. Transform to Chessboard

Hard
785. Is Graph Bipartite?

Med.
788. Rotated Digits

Med.
799. Champagne Tower

Med.
803. Bricks Falling When Hit

Hard
813. Largest Sum of Averages

Med.
817. Linked List Components

Med.
835. Image Overlap

Med.
838. Push Dominoes

Med.
840. Magic Squares In Grid

Med.
710. Random Pick with Blacklist

Hard
889. Construct Binary Tree from Preorder and Postorder Traversal

Med.
906. Super Palindromes

Hard
913. Cat and Mouse

Hard
914. X of a Kind in a Deck of Cards

Easy
916. Word Subsets

Med.
919. Complete Binary Tree Inserter

Med.
977. Squares of a Sorted Array

Easy
1055. Shortest Way to Form String

Med.
1066. Campus Bikes II

Med.
1088. Confusing Number II

Hard
1027. Longest Arithmetic Subsequence

Med.
1037. Valid Boomerang

Easy
1153. String Transforms Into Another String

Hard
1167. Minimum Cost to Connect Sticks

Med.
1052. Grumpy Bookstore Owner

Med.
1078. Occurrences After Bigram

Easy
1231. Divide Chocolate

Hard
1114. Print in Order

Easy
1289. Minimum Falling Path Sum II

Hard
1314. Matrix Block Sum

Med.
1144. Decrease Elements To Make Array Zigzag

Med.
1331. Rank Transform of an Array

Easy
1632. Rank Transform of a Matrix

Hard
2079. Watering Plants

Med.
1706. Where Will the Ball Fall

Med.
1206. Design Skiplist

Hard
1618. Maximum Font to Fit a Sentence in a Screen

Med.
2218. Maximum Value of K Coins From Piles

Hard
1267. Count Servers that Communicate

Med.
1269. Number of Ways to Stay in the Same Place After Some Steps

Hard
1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold

Med.
1320. Minimum Distance to Type a Word Using Two Fingers

Hard
1366. Rank Teams by Votes

Med.
1387. Sort Integers by The Power Value

Med.
1388. Pizza With 3n Slices

Hard
1392. Longest Happy Prefix

Hard
1461. Check If a String Contains All Binary Codes of Size K

Med.
1504. Count Submatrices With All Ones

Med.
1526. Minimum Number of Increments on Subarrays to Form a Target Array

Hard
1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target

Med.
1516. Move Sub-Tree of N-Ary Tree

Hard
1553. Minimum Number of Days to Eat N Oranges

Hard
1562. Find Latest Group of Size M

Med.
1564. Put Boxes Into the Warehouse I

Med.
1593. Split a String Into the Max Number of Unique Substrings

Med.
1600. Throne Inheritance

Med.
1622. Fancy Sequence

Hard
1658. Minimum Operations to Reduce X to Zero

Med.
1703. Minimum Adjacent Swaps for K Consecutive Ones

Hard
1692. Count Ways to Distribute Candies

Hard
1736. Latest Time by Replacing Hidden Digits

Easy
1753. Maximum Score From Removing Stones

Med.
1774. Closest Dessert Cost

Med.
1786. Number of Restricted Paths From First to Last Node

Med.
1813. Sentence Similarity III

Med.
1807. Evaluate the Bracket Pairs of a String

Med.
1823. Find the Winner of the Circular Game

Med.
1850. Minimum Adjacent Swaps to Reach the Kth Smallest Number

Med.
1866. Number of Ways to Rearrange Sticks With K Sticks Visible

Hard
1870. Minimum Speed to Arrive on Time

Med.
1871. Jump Game VII

Med.
1858. Longest Word With All Prefixes

Med.
1883. Minimum Skips to Arrive at Meeting On Time

Hard
1906. Minimum Absolute Difference Queries

Med.
1915. Number of Wonderful Substrings

Med.
1891. Cutting Ribbons

Med.
1940. Longest Common Subsequence Between Sorted Arrays

Med.
1966. Binary Searchable Numbers in an Unsorted Array

Med.
2126. Destroying Asteroids

Med.
2128. Remove All Ones With Row and Column Flips

Med.
2196. Create Binary Tree From Descriptions

Med.
2190. Most Frequent Number Following Key In an Array

Easy
2255. Count Prefixes of a Given String

Easy
2224. Minimum Number of Operations to Convert Time

Easy
2286. Booking Concert Tickets in Groups

Hard
2296. Design a Text Editor

Hard
2311. Longest Binary Subsequence Less Than or Equal to K

Med.
2254. Design Video Sharing Platform

Hard
2334. Subarray With Elements Greater Than Varying Threshold

Hard
2348. Number of Zero-Filled Subarrays

Med.
2424. Longest Uploaded Prefix

Med.
2442. Count Number of Distinct Integers After Reverse Operations

Med.
2446. Determine if Two Events Have Conflict

Easy
2498. Frog Jump II

Med.
2531. Make Number of Distinct Characters Equal

Med.
2556. Disconnect Path in a Binary Matrix by at Most One Flip

Med.
2779. Maximum Beauty of an Array After Applying Operation

Med.
2857. Count Pairs of Points With Distance k

Med.
2817. Minimum Absolute Difference Between Elements With Constraint

Med.
2851. String Transformation

Hard
2872. Maximum Number of K-Divisible Components

Hard
2936. Number of Equal Numbers Blocks

Med.
2981. Find Longest Special Substring That Occurs Thrice I

Med.
3027. Find the Number of Ways to Place People II

Hard
3093. Longest Common Suffix Queries

Hard
3137. Minimum Number of Operations to Make Word K-Periodic

Med.
3153. Sum of Digit Differences of All Pairs

Med.
3169. Count Days Without Meetings

Med.
3217. Delete Nodes From Linked List Present in Array

Med.
90. Subsets II

Med.
98. Validate Binary Search Tree

Med.
112. Path Sum

Easy
130. Surrounded Regions

Med.
199. Binary Tree Right Side View

Med.
237. Delete Node in a Linked List

Med.
246. Strobogrammatic Number

Easy
251. Flatten 2D Vector

Med.
258. Add Digits

Easy
268. Missing Number

Easy
272. Closest Binary Search Tree Value II

Hard
276. Paint Fence

Med.
284. Peeking Iterator

Med.
288. Unique Word Abbreviation

Med.
294. Flip Game II

Med.
313. Super Ugly Number

Med.
320. Generalized Abbreviation

Med.
331. Verify Preorder Serialization of a Binary Tree

Med.
334. Increasing Triplet Subsequence

Med.
358. Rearrange String k Distance Apart

Hard
360. Sort Transformed Array

Med.
369. Plus One Linked List

Med.
370. Range Addition

Med.
391. Perfect Rectangle

Hard
397. Integer Replacement

Med.
401. Binary Watch

Easy
411. Minimum Unique Word Abbreviation

Hard
422. Valid Word Square

Easy
425. Word Squares

Hard
471. Encode String with Shortest Length

Hard
481. Magical String

Med.
483. Smallest Good Base

Hard
484. Find Permutation

Med.
2031. Count Subarrays With More Ones Than Zeros

Med.
1059. All Paths from Source Lead to Destination

Med.
521. Longest Uncommon Subsequence I

Easy
523. Continuous Subarray Sum

Med.
527. Word Abbreviation

Hard
531. Lonely Pixel I

Med.
533. Lonely Pixel II

Med.
535. Encode and Decode TinyURL

Med.
545. Boundary of Binary Tree

Med.
562. Longest Line of Consecutive One in Matrix

Med.
568. Maximum Vacation Days

Hard
570. Managers with at Least 5 Direct Reports

Med.
638. Shopping Offers

Med.
644. Maximum Average Subarray II

Hard
647. Palindromic Substrings

Med.
656. Coin Path

Hard
668. Kth Smallest Number in Multiplication Table

Hard
676. Implement Magic Dictionary

Med.
683. K Empty Slots

Hard
687. Longest Univalue Path

Med.
689. Maximum Sum of 3 Non-Overlapping Subarrays

Hard
731. My Calendar II

Med.
735. Asteroid Collision

Med.
748. Shortest Completing Word

Easy
756. Pyramid Transition Matrix

Med.
758. Bold Words in String

Med.
760. Find Anagram Mappings

Easy
768. Max Chunks To Make Sorted II

Hard
769. Max Chunks To Make Sorted

Med.
702. Search in a Sorted Array of Unknown Size

Med.
774. Minimize Max Distance to Gas Station

Hard
789. Escape The Ghosts

Med.
800. Similar RGB Color

Easy
809. Expressive Words

Med.
812. Largest Triangle Area

Easy
816. Ambiguous Coordinates

Med.
708. Insert into a Sorted Circular Linked List

Med.
830. Positions of Large Groups

Easy
854. K-Similar Strings

Hard
855. Exam Room

Med.
871. Minimum Number of Refueling Stops

Hard
519. Random Flip Matrix

Med.
907. Sum of Subarray Minimums

Med.
911. Online Election

Med.
954. Array of Doubled Pairs

Med.
955. Delete Columns to Make Sorted II

Med.
1057. Campus Bikes

Med.
1009. Complement of Base 10 Integer

Easy
1012. Numbers With Repeated Digits

Hard
1015. Smallest Integer Divisible by K

Med.
1016. Binary String With Substrings Representing 1 To N

Med.
1023. Camelcase Matching

Med.
1121. Divide Array Into Increasing Sequences

Hard
1165. Single-Row Keyboard

Easy
1182. Shortest Distance to Target Color

Med.
1081. Smallest Subsequence of Distinct Characters

Med.
1079. Letter Tile Possibilities

Med.
1199. Minimum Time to Build Blocks

Hard
1090. Largest Values From Labels

Med.
1245. Tree Diameter

Med.
1096. Brace Expansion II

Hard
1272. Remove Interval

Med.
1619. Mean of Array After Removing Some Elements

Easy
1286. Iterator for Combination

Med.
1300. Sum of Mutated Array Closest to Target

Med.
1316. Distinct Echo Substrings

Hard
1170. Compare Strings by Frequency of the Smallest Character

Med.
1184. Distance Between Bus Stops

Easy
2226. Maximum Candies Allocated to K Children

Med.
1726. Tuple with Same Product

Med.
1261. Find Elements in a Contaminated Binary Tree

Med.
2304. Minimum Path Cost in a Grid

Med.
1268. Search Suggestions System

Med.
1270. All People Report to the Given Manager

Med.
1414. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K

Med.
1431. Kids With the Greatest Number of Candies

Easy
1447. Simplified Fractions

Med.
1449. Form Largest Integer With Digits That Add up to Target

Hard
1444. Number of Ways of Cutting a Pizza

Hard
1452. People Whose List of Favorite Companies Is Not a Subset of Another List

Med.
1477. Find Two Non-overlapping Sub-arrays Each With Target Sum

Med.
1470. Shuffle the Array

Easy
1471. The k Strongest Values in an Array

Med.
1513. Number of Substrings With Only 1s

Med.
1539. Kth Missing Positive Number

Easy
1538. Guess the Majority in a Hidden Array

Med.
1548. The Most Similar Path in a Graph

Hard
1591. Strange Printer II

Hard
1585. Check If String Is Transformable With Substring Sort Operations

Hard
1594. Maximum Non Negative Product in a Matrix

Med.
1595. Minimum Cost to Connect Two Groups of Points

Hard
1580. Put Boxes Into the Warehouse II

Med.
1728. Cat and Mouse II

Hard
1610. Maximum Number of Visible Points

Hard
1602. Find Nearest Right Node in Binary Tree

Med.
1612. Check If Two Expression Trees are Equivalent

Med.
1655. Distribute Repeating Integers

Hard
1673. Find the Most Competitive Subsequence

Med.
1660. Correct a Binary Tree

Med.
1666. Change the Root of a Binary Tree

Med.
1713. Minimum Operations to Make a Subsequence

Hard
1722. Minimize Hamming Distance After Swap Operations

Med.
1708. Largest Subarray Length K

Easy
1737. Change Minimum Characters to Satisfy One of Three Conditions

Med.
1738. Find Kth Largest XOR Coordinate Value

Med.
1724. Checking Existence of Edge Length Limited Paths II

Hard
1766. Tree of Coprimes

Hard
1765. Map of Highest Peak

Med.
1769. Minimum Number of Operations to Move All Balls to Each Box

Med.
1767. Find the Subtasks That Did Not Execute

Hard
1815. Maximum Number of Groups Getting Fresh Donuts

Hard
1806. Minimum Number of Operations to Reinitialize a Permutation

Med.
1794. Count Pairs of Equal Substrings With Minimum Difference

Med.
1810. Minimum Path Cost in a Hidden Grid

Med.
1821. Find Customers With Positive Revenue this Year

Easy
1896. Minimum Cost to Change the Final Value of Expression

Hard
1888. Minimum Number of Flips to Make the Binary String Alternating

Med.
1899. Merge Triplets to Form Target Triplet

Med.
1900. The Earliest and Latest Rounds Where Players Compete

Hard
1874. Minimize Product Sum of Two Arrays

Med.
1943. Describe the Painting

Med.
1929. Concatenation of Array

Easy
1931. Painting a Grid With Three Different Colors

Hard
1918. Kth Smallest Subarray Sum

Med.
1924. Erect the Fence II

Hard
1993. Operations on Tree

Med.
2022. Convert 1D Array Into 2D Array

Easy
2059. Minimum Operations to Convert Number

Med.
2076. Process Restricted Friend Requests

Hard
2077. Paths in Maze That Lead to Same Room

Med.
2105. Watering Plants II

Med.
2122. Recover the Original Array

Hard
2135. Count Words Obtained After Adding a Letter

Med.
2155. All Divisions With the Highest Score of a Binary Array

Med.
2150. Find All Lonely Numbers in the Array

Med.
2167. Minimum Time to Remove All Cars Containing Illegal Goods

Hard
2209. Minimum White Tiles After Covering With Carpets

Hard
2174. Remove All Ones With Row and Column Flips II

Med.
2200. Find All K-Distant Indices in an Array

Easy
2203. Minimum Weighted Subgraph With the Required Paths

Hard
2267. Check if There Is a Valid Parentheses String Path

Hard
2241. Design an ATM Machine

Med.
2280. Minimum Lines to Represent a Line Chart

Med.
2283. Check if Number Has Equal Digit Count and Digit Value

Easy
2237. Count Positions on Street With Required Brightness

Med.
2315. Count Asterisks

Easy
2351. First Letter to Appear Twice

Easy
2350. Shortest Impossible Sequence of Rolls

Hard
2363. Merge Similar Items

Easy
2459. Sort Array by Moving Items to Empty Space

Hard
2371. Minimize Maximum Value in a Grid

Hard
2452. Words Within Two Edits of Dictionary

Med.
2476. Closest Nodes Queries in a Binary Search Tree

Med.
2536. Increment Submatrices by One

Med.
2510. Check if There is a Path With Equal Number of 0's And 1's

Med.
2663. Lexicographically Smallest Beautiful String

Hard
2570. Merge Two 2D Arrays by Summing Values

Easy
2601. Prime Subtraction Operation

Med.
2689. Extract Kth Character From The Rope Tree

Easy
2763. Sum of Imbalance Numbers of All Subarrays

Hard
2728. Count Houses in a Circular Street

Easy
2849. Determine if a Cell Is Reachable at a Given Time

Med.
2919. Minimum Increment Operations to Make Array Beautiful

Med.
2923. Find Champion I

Easy
2924. Find Champion II

Med.
2925. Maximum Score After Applying Operations on a Tree

Med.
3007. Maximum Number That Sum of the Prices Is Less Than or Equal to K

Med.
2966. Divide Array Into Arrays With Max Difference

Med.
3025. Find the Number of Ways to Place People I

Med.
3047. Find the Largest Area of Square Inside Two Rectangles

Med.
3114. Latest Time You Can Obtain After Replacing Characters

Easy
3117. Minimum Sum of Values by Dividing Array

Hard
95. Unique Binary Search Trees II

Med.
119. Pascal's Triangle II

Easy
175. Combine Two Tables

Easy
185. Department Top Three Salaries

Hard
190. Reverse Bits

Easy
232. Implement Queue using Stacks

Easy
235. Lowest Common Ancestor of a Binary Search Tree

Med.
395. Longest Substring with At Least K Repeating Characters

Med.
454. 4Sum II

Med.
518. Coin Change II

Med.
605. Can Place Flowers

Easy
427. Construct Quad Tree

Med.
846. Hand of Straights

Med.
881. Boats to Save People

Med.
933. Number of Recent Calls

Easy
1091. Shortest Path in Binary Matrix

Med.
1148. Article Views I

Easy
1832. Check if the Sentence Is Pangram

Easy
1920. Build Array from Permutation

Easy
2149. Rearrange Array Elements by Sign

Med.
2619. Array Prototype Last

Easy
60. Permutation Sequence

Hard
61. Rotate List

Med.
96. Unique Binary Search Trees

Med.
102. Binary Tree Level Order Traversal

Med.
103. Binary Tree Zigzag Level Order Traversal

Med.
110. Balanced Binary Tree

Easy
176. Second Highest Salary

Med.
211. Design Add and Search Words Data Structure

Med.
219. Contains Duplicate II

Easy
350. Intersection of Two Arrays II

Easy
371. Sum of Two Integers

Med.
419. Battleships in a Board

Med.
455. Assign Cookies

Easy
502. IPO

Hard
588. Design In-Memory File System

Hard
633. Sum of Square Numbers

Med.
642. Design Search Autocomplete System

Hard
655. Print Binary Tree

Med.
771. Jewels and Stones

Easy
861. Score After Flipping Matrix

Med.
863. All Nodes Distance K in Binary Tree

Med.
920. Number of Music Playlists

Hard
930. Binary Subarrays With Sum

Med.
931. Minimum Falling Path Sum

Med.
946. Validate Stack Sequences

Med.
968. Binary Tree Cameras

Hard
973. K Closest Points to Origin

Med.
974. Subarray Sums Divisible by K

Med.
1192. Critical Connections in a Network

Hard
1472. Design Browser History

Med.
1661. Average Time of Process per Machine

Easy
1752. Check if Array Is Sorted and Rotated

Easy
1854. Maximum Population Year

Easy
1971. Find if Path Exists in Graph

Easy
2141. Maximum Running Time of N Computers

Hard
2700. Differences Between Two Objects

Med.
2704. To Be Or Not To Be

Easy
38. Count and Say

Med.
86. Partition List

Med.
93. Restore IP Addresses

Med.
97. Interleaving String

Med.
167. Two Sum II - Input Array Is Sorted

Med.
174. Dungeon Game

Hard
179. Largest Number

Med.
181. Employees Earning More Than Their Managers

Easy
264. Ugly Number II

Med.
413. Arithmetic Slices

Med.
437. Path Sum III

Med.
532. K-diff Pairs in an Array

Med.
577. Employee Bonus

Easy
593. Valid Square

Med.
678. Valid Parenthesis String

Med.
752. Open the Lock

Med.
703. Kth Largest Element in a Stream

Easy
705. Design HashSet

Easy
706. Design HashMap

Easy
885. Spiral Matrix III

Med.
901. Online Stock Span

Med.
905. Sort Array By Parity

Easy
1094. Car Pooling

Med.
1378. Replace Employee ID With The Unique Identifier

Easy
1395. Count Number of Teams

Med.
1552. Magnetic Force Between Two Balls

Med.
1653. Minimum Deletions to Make String Balanced

Med.
1934. Confirmation Rate

Med.
2582. Pass the Pillow

Easy
43. Multiply Strings

Med.
160. Intersection of Two Linked Lists

Easy
180. Consecutive Numbers

Med.
182. Duplicate Emails

Easy
187. Repeated DNA Sequences

Med.
225. Implement Stack using Queues

Easy
227. Basic Calculator II

Med.
233. Number of Digit One

Hard
328. Odd Even Linked List

Med.
338. Counting Bits

Easy
342. Power of Four

Easy
367. Valid Perfect Square

Easy
384. Shuffle an Array

Med.
446. Arithmetic Slices II - Subsequence

Hard
496. Next Greater Element I

Easy
653. Two Sum IV - Input is a BST

Easy
695. Max Area of Island

Med.
713. Subarray Product Less Than K

Med.
701. Insert into a Binary Search Tree

Med.
862. Shortest Subarray with Sum at Least K

Hard
945. Minimum Increment to Make Array Unique

Med.
949. Largest Time for Given Digits

Med.
1043. Partition Array for Maximum Sum

Med.
1122. Relative Sort Array

Easy
1155. Number of Dice Rolls With Target Sum

Med.
1164. Product Price at a Given Date

Med.
1174. Immediate Food Delivery II

Med.
1248. Count Number of Nice Subarrays

Med.
1342. Number of Steps to Reduce a Number to Zero

Easy
1386. Cinema Seat Allocation

Med.
1456. Maximum Number of Vowels in a Substring of Given Length

Med.
1572. Matrix Diagonal Sum

Easy
1579. Remove Max Number of Edges to Keep Graph Fully Traversable

Hard
1581. Customer Who Visited but Did Not Make Any Transactions

Easy
1716. Calculate Money in Leetcode Bank

Easy
1910. Remove All Occurrences of a Substring

Med.
2095. Delete the Middle Node of a Linked List

Med.
2131. Longest Palindrome by Concatenating Two Letter Words

Med.
2448. Minimum Cost to Make Array Equal

Hard
40. Combination Sum II

Med.
52. N-Queens II

Hard
77. Combinations

Med.
87. Scramble String

Hard
105. Construct Binary Tree from Preorder and Inorder Traversal

Med.
116. Populating Next Right Pointers in Each Node

Med.
123. Best Time to Buy and Sell Stock III

Hard
126. Word Ladder II

Hard
129. Sum Root to Leaf Numbers

Med.
154. Find Minimum in Rotated Sorted Array II

Hard
188. Best Time to Buy and Sell Stock IV

Hard
201. Bitwise AND of Numbers Range

Med.
223. Rectangle Area

Med.
241. Different Ways to Add Parentheses

Med.
252. Meeting Rooms

Easy
260. Single Number III

Med.
301. Remove Invalid Parentheses

Hard
319. Bulb Switcher

Med.
438. Find All Anagrams in a String

Med.
458. Poor Pigs

Hard
516. Longest Palindromic Subsequence

Med.
556. Next Greater Element III

Med.
620. Not Boring Movies

Easy
664. Strange Printer

Hard
688. Knight Probability in Chessboard

Med.
740. Delete and Earn

Med.
428. Serialize and Deserialize N-ary Tree

Hard
796. Rotate String

Easy
801. Minimum Swaps To Make Sequences Increasing

Hard
806. Number of Lines To Write String

Easy
707. Design Linked List

Med.
896. Monotonic Array

Easy
918. Maximum Sum Circular Subarray

Med.
925. Long Pressed Name

Easy
940. Distinct Subsequences II

Hard
986. Interval List Intersections

Med.
997. Find the Town Judge

Easy
1002. Find Common Characters

Easy
1047. Remove All Adjacent Duplicates In String

Easy
1220. Count Vowels Permutation

Hard
1251. Average Selling Price

Easy
1281. Subtract the Product and Sum of Digits of an Integer

Easy
1448. Count Good Nodes in Binary Tree

Med.
1492. The kth Factor of n

Med.
1481. Least Number of Unique Integers after K Removals

Med.
1496. Path Crossing

Easy
1528. Shuffle String

Easy
1636. Sort Array by Increasing Frequency

Easy
1679. Max Number of K-Sum Pairs

Med.
1820. Maximum Number of Accepted Invitations

Med.
1926. Nearest Exit from Entrance in Maze

Med.
1970. Last Day Where You Can Still Cross

Hard
2367. Number of Arithmetic Triplets

Easy
2369. Check if There is a Valid Partition For The Array

Med.
2396. Strictly Palindromic Number

Med.
2461. Maximum Sum of Distinct Subarrays With Length K

Med.
2540. Minimum Common Value

Easy
2542. Maximum Subsequence Score

Med.
2666. Allow One Function Call

Easy
2742. Painting the Walls

Hard
2769. Find the Maximum Achievable Number

Easy
2709. Greatest Common Divisor Traversal

Hard
2878. Get the Size of a DataFrame

Easy
2945. Find Maximum Non-decreasing Array Length

Hard
99. Recover Binary Search Tree

Med.
108. Convert Sorted Array to Binary Search Tree

Easy
111. Minimum Depth of Binary Tree

Easy
222. Count Complete Tree Nodes

Easy
290. Word Pattern

Easy
343. Integer Break

Med.
420. Strong Password Checker

Hard
452. Minimum Number of Arrows to Burst Balloons

Med.
500. Keyboard Row

Easy
513. Find Bottom Left Tree Value

Med.
557. Reverse Words in a String III

Easy
564. Find the Closest Palindrome

Hard
572. Subtree of Another Tree

Easy
611. Valid Triangle Number

Med.
623. Add One Row to Tree

Med.
645. Set Mismatch

Easy
646. Maximum Length of Pair Chain

Med.
648. Replace Words

Med.
680. Valid Palindrome II

Easy
682. Baseball Game

Easy
718. Maximum Length of Repeated Subarray

Med.
741. Cherry Pickup

Hard
772. Basic Calculator III

Hard
827. Making A Large Island

Hard
622. Design Circular Queue

Med.
867. Transpose Matrix

Easy
878. Nth Magical Number

Hard
950. Reveal Cards In Increasing Order

Med.
953. Verifying an Alien Dictionary

Easy
967. Numbers With Same Consecutive Differences

Med.
980. Unique Paths III

Hard
983. Minimum Cost For Tickets

Med.
992. Subarrays with K Different Integers

Hard
1008. Construct Binary Search Tree from Preorder Traversal

Med.
1026. Maximum Difference Between Node and Ancestor

Med.
1102. Path With Maximum Minimum Value

Med.
1068. Product Sales Analysis I

Easy
1092. Shortest Common Supersequence

Hard
1244. Design A Leaderboard

Med.
1108. Defanging an IP Address

Easy
1125. Smallest Sufficient Team

Hard
1137. N-th Tribonacci Number

Easy
1171. Remove Zero Sum Consecutive Nodes from Linked List

Med.
1361. Validate Binary Tree Nodes

Med.
1425. Constrained Subsequence Sum

Hard
1187. Make Array Strictly Increasing

Hard
1550. Three Consecutive Odds

Easy
1190. Reverse Substrings Between Each Pair of Parentheses

Med.
1193. Monthly Transactions I

Med.
1211. Queries Quality and Percentage

Easy
1280. Students and Examinations

Easy
1306. Jump Game III

Med.
1381. Design a Stack With Increment Operation

Med.
1383. Maximum Performance of a Team

Hard
1436. Destination City

Easy
1442. Count Triplets That Can Form Two Arrays of Equal XOR

Med.
1491. Average Salary Excluding the Minimum and Maximum Salary

Easy
1523. Count Odd Numbers in an Interval Range

Easy
1517. Find Users With Valid E-Mails

Easy
1601. Maximum Number of Achievable Transfer Requests

Hard
1657. Determine if Two Strings Are Close

Med.
1700. Number of Students Unable to Eat Lunch

Easy
1710. Maximum Units on a Truck

Easy
1732. Find the Highest Altitude

Easy
1759. Count Number of Homogenous Substrings

Med.
1803. Count Pairs With XOR in a Range

Hard
1845. Seat Reservation Manager

Med.
1909. Remove One Element to Make the Array Strictly Increasing

Easy
1930. Unique Length-3 Palindromic Subsequences

Med.
1980. Find Unique Binary String

Med.
2037. Minimum Number of Moves to Seat Everyone

Easy
2116. Check if a Parentheses String Can Be Valid

Med.
2352. Equal Row and Column Pairs

Med.
2385. Amount of Time for Binary Tree to Be Infected

Med.
2404. Most Frequent Even Element

Easy
2356. Number of Unique Subjects Taught by Each Teacher

Easy
2427. Number of Common Factors

Easy
2486. Append Characters to String to Make Subsequence

Med.
2534. Time Taken to Cross the Door

Hard
2616. Minimize the Maximum Difference of Pairs

Med.
2618. Check if Object Instance of Class

Med.
2723. Add Two Promises

Easy
2816. Double a Number Represented as a Linked List

Med.
2973. Find Number of Coins to Place in Tree Nodes

Hard
47. Permutations II

Med.
59. Spiral Matrix II

Med.
65. Valid Number

Hard
81. Search in Rotated Sorted Array II

Med.
89. Gray Code

Med.
106. Construct Binary Tree from Inorder and Postorder Traversal

Med.
120. Triangle

Med.
144. Binary Tree Preorder Traversal

Easy
147. Insertion Sort List

Med.
157. Read N Characters Given Read4

Easy
165. Compare Version Numbers

Med.
183. Customers Who Never Order

Easy
191. Number of 1 Bits

Easy
196. Delete Duplicate Emails

Easy
203. Remove Linked List Elements

Easy
220. Contains Duplicate III

Hard
307. Range Sum Query - Mutable

Med.
376. Wiggle Subsequence

Med.
390. Elimination Game

Med.
404. Sum of Left Leaves

Easy
441. Arranging Coins

Easy
495. Teemo Attacking

Easy
529. Minesweeper

Med.
1730. Shortest Path to Get Food

Med.
561. Array Partition

Easy
608. Tree Node

Med.
609. Find Duplicate File in System

Med.
629. K Inverse Pairs Array

Hard
650. 2 Keys Keyboard

Med.
670. Maximum Swap

Med.
673. Number of Longest Increasing Subsequence

Med.
674. Longest Continuous Increasing Subsequence

Easy
675. Cut Off Trees for Golf Event

Hard
696. Count Binary Substrings

Easy
698. Partition to K Equal Sum Subsets

Med.
712. Minimum ASCII Delete Sum for Two Strings

Med.
429. N-ary Tree Level Order Traversal

Med.
430. Flatten a Multilevel Doubly Linked List

Med.
700. Search in a Binary Search Tree

Easy
826. Most Profit Assigning Work

Med.
829. Consecutive Numbers Sum

Hard
850. Rectangle Area II

Hard
470. Implement Rand10() Using Rand7()

Med.
872. Leaf-Similar Trees

Easy
886. Possible Bipartition

Med.
897. Increasing Order Search Tree

Easy
921. Minimum Add to Make Parentheses Valid

Med.
956. Tallest Billboard

Hard
961. N-Repeated Element in Size 2N Array

Easy
990. Satisfiability of Equality Equations

Med.
995. Minimum Number of K Consecutive Bit Flips

Hard
1062. Longest Repeating Substring

Med.
1025. Divisor Game

Easy
1028. Recover a Tree From Preorder Traversal

Hard
1044. Longest Duplicate Substring

Hard
1166. Design File System

Med.
1046. Last Stone Weight

Easy
1051. Height Checker

Easy
1074. Number of Submatrices That Sum to Target

Hard
1070. Product Sales Analysis III

Med.
1106. Parsing A Boolean Expression

Hard
1129. Shortest Path with Alternating Colors

Med.
1141. User Activity for the Past 30 Days I

Easy
1360. Number of Days Between Two Dates

Easy
1363. Largest Multiple of Three

Hard
1204. Last Person to Fit in the Bus

Med.
2191. Sort the Jumbled Numbers

Med.
2193. Minimum Number of Moves to Make Palindrome

Hard
1263. Minimum Moves to Move a Box to Their Target Location

Hard
1283. Find the Smallest Divisor Given a Threshold

Med.
1290. Convert Binary Number in a Linked List to Integer

Easy
1307. Verbal Arithmetic Puzzle

Hard
1312. Minimum Insertion Steps to Make a String Palindrome

Hard
1325. Delete Leaves With a Given Value

Med.
1326. Minimum Number of Taps to Open to Water a Garden

Hard
1335. Minimum Difficulty of a Job Schedule

Hard
1359. Count All Valid Pickup and Delivery Options

Hard
1337. The K Weakest Rows in a Matrix

Easy
1373. Maximum Sum BST in Binary Tree

Hard
1397. Find All Good Strings

Hard
1404. Number of Steps to Reduce a Number in Binary Representation to One

Med.
1410. HTML Entity Parser

Med.
1476. Subrectangle Queries

Med.
1535. Find the Winner of an Array Game

Med.
1561. Maximum Number of Coins You Can Get

Med.
1584. Min Cost to Connect All Points

Med.
1606. Find Servers That Handled Most Number of Requests

Hard
1614. Maximum Nesting Depth of the Parentheses

Easy
1639. Number of Ways to Form a Target String Given a Dictionary

Hard
1641. Count Sorted Vowel Strings

Med.
1647. Minimum Deletions to Make Character Frequencies Unique

Med.
1701. Average Waiting Time

Med.
1667. Fix Names in a Table

Easy
1731. The Number of Employees Which Report to Each Employee

Easy
1824. Minimum Sideway Jumps

Med.
1964. Find the Longest Valid Obstacle Course at Each Position

Hard
1979. Find Greatest Common Divisor of Array

Easy
2009. Minimum Number of Operations to Make Array Continuous

Hard
2011. Final Value of Variable After Performing Operations

Easy
2058. Find the Minimum and Maximum Number of Nodes Between Critical Points

Med.
2064. Minimized Maximum of Products Distributed to Any Store

Med.
2104. Sum of Subarray Ranges

Med.
2108. Find First Palindromic String in the Array

Easy
2134. Minimum Swaps to Group All 1's Together II

Med.
2259. Remove Digit From Number to Maximize Result

Easy
2276. Count Integers in Intervals

Hard
2300. Successful Pairs of Spells and Potions

Med.
2337. Move Pieces to Obtain a String

Med.
2370. Longest Ideal Subsequence

Med.
2444. Count Subarrays With Fixed Bounds

Hard
2440. Create Components With Same Value

Hard
2484. Count Palindromic Subsequences

Hard
2678. Number of Senior Citizens

Easy
2627. Debounce

Med.
2635. Apply Transform Over Each Element in Array

Easy
2706. Buy Two Chocolates

Easy
2831. Find the Longest Equal Subarray

Med.
2770. Maximum Number of Jumps to Reach the Last Index

Med.
2811. Check if it is Possible to Split Array

Med.
2824. Count Pairs Whose Sum is Less than Target

Easy
2958. Length of Longest Subarray With at Most K Frequency

Med.
2976. Minimum Cost to Convert String I

Med.
3068. Find the Maximum Sum of Node Values

Hard
3234. Count the Number of Substrings With Dominant Ones

Med.
82. Remove Duplicates from Sorted List II

Med.
107. Binary Tree Level Order Traversal II

Med.
109. Convert Sorted List to Binary Search Tree

Med.
113. Path Sum II

Med.
117. Populating Next Right Pointers in Each Node II

Med.
145. Binary Tree Postorder Traversal

Easy
161. One Edit Distance

Med.
171. Excel Sheet Column Number

Easy
172. Factorial Trailing Zeroes

Med.
178. Rank Scores

Med.
184. Department Highest Salary

Med.
193. Valid Phone Numbers

Easy
248. Strobogrammatic Number III

Hard
256. Paint House

Med.
277. Find the Celebrity

Med.
292. Nim Game

Easy
303. Range Sum Query - Immutable

Easy
304. Range Sum Query 2D - Immutable

Med.
352. Data Stream as Disjoint Intervals

Hard
398. Random Pick Index

Med.
405. Convert a Number to Hexadecimal

Easy
414. Third Maximum Number

Easy
436. Find Right Interval

Med.
445. Add Two Numbers II

Med.
450. Delete Node in a BST

Med.
456. 132 Pattern

Med.
472. Concatenated Words

Hard
504. Base 7

Easy
515. Find Largest Value in Each Tree Row

Med.
554. Brick Wall

Med.
563. Binary Tree Tilt

Easy
610. Triangle Judgement

Easy
617. Merge Two Binary Trees

Easy
627. Swap Salary

Easy
636. Exclusive Time of Functions

Med.
661. Image Smoother

Easy
691. Stickers to Spell Word

Hard
716. Max Stack

Hard
722. Remove Comments

Med.
709. To Lower Case

Easy
744. Find Smallest Letter Greater Than Target

Easy
745. Prefix and Suffix Search

Hard
558. Logical OR of Two Binary Grids Represented as Quad-Trees

Med.
776. Split BST

Med.
781. Rabbits in Forest

Med.
784. Letter Case Permutation

Med.
786. K-th Smallest Prime Fraction

Med.
791. Custom Sort String

Med.
807. Max Increase to Keep City Skyline

Med.
814. Binary Tree Pruning

Med.
819. Most Common Word

Easy
823. Binary Trees With Factors

Med.
641. Design Circular Deque

Med.
869. Reordered Power of 2

Med.
888. Fair Candy Swap

Easy
892. Surface Area of 3D Shapes

Easy
915. Partition Array into Disjoint Intervals

Med.
922. Sort Array By Parity II

Easy
943. Find the Shortest Superstring

Hard
958. Check Completeness of a Binary Tree

Med.
993. Cousins in Binary Tree

Easy
1005. Maximize Sum Of Array After K Negations

Easy
1014. Best Sightseeing Pair

Med.
1067. Digit Count in Range

Hard
1029. Two City Scheduling

Med.
1035. Uncrossed Lines

Med.
1036. Escape a Large Maze

Hard
1039. Minimum Score Triangulation of Polygon

Med.
1042. Flower Planting With No Adjacent

Med.
511. Game Play Analysis I

Easy
550. Game Play Analysis IV

Med.
1117. Building H2O

Med.
1291. Sequential Digits

Med.
1123. Lowest Common Ancestor of Deepest Leaves

Med.
1130. Minimum Cost Tree From Leaf Values

Med.
1328. Break a Palindrome

Med.
1382. Balance a Binary Search Tree

Med.
1202. Smallest String With Swaps

Med.
1232. Check If It Is a Straight Line

Easy
2225. Find Players With Zero or One Losses

Med.
1239. Maximum Length of a Concatenated String with Unique Characters

Med.
1250. Check If It Is a Good Array

Hard
1255. Maximum Score Words Formed by Letters

Hard
1266. Minimum Time Visiting All Points

Easy
1275. Find Winner on a Tic Tac Toe Game

Easy
1309. Decrypt String from Alphabet to Integer Mapping

Easy
1310. XOR Queries of a Subarray

Med.
1319. Number of Operations to Make Network Connected

Med.
1323. Maximum 69 Number

Easy
1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance

Med.
1358. Number of Substrings Containing All Three Characters

Med.
1347. Minimum Number of Steps to Make Two Strings Anagram

Med.
1351. Count Negative Numbers in a Sorted Matrix

Easy
1353. Maximum Number of Events That Can Be Attended

Med.
1367. Linked List in Binary Tree

Med.
1416. Restore The Array

Hard
1420. Build Array Where You Can Find The Maximum Exactly K Comparisons

Hard
1443. Minimum Time to Collect All Apples in a Tree

Med.
1458. Max Dot Product of Two Subsequences

Hard
1475. Final Prices With a Special Discount in a Shop

Easy
1466. Reorder Routes to Make All Paths Lead to the City Zero

Med.
1493. Longest Subarray of 1's After Deleting One Element

Med.
1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree

Hard
1497. Check If Array Pairs Are Divisible by k

Med.
1588. Sum of All Odd Length Subarrays

Easy
1554. Strings Differ by One Character

Med.
1578. Minimum Time to Make Rope Colorful

Med.
1587. Bank Account Summary II

Easy
1615. Maximal Network Rank

Med.
1637. Widest Vertical Area Between Two Points Containing No Points

Easy
1624. Largest Substring Between Two Equal Characters

Easy
1656. Design an Ordered Stream

Easy
1662. Check If Two String Arrays are Equivalent

Easy
1685. Sum of Absolute Differences in a Sorted Array

Med.
1689. Partitioning Into Minimum Number Of Deci-Binary Numbers

Med.
1696. Jump Game VI

Med.
1723. Find Minimum Time to Finish All Jobs

Hard
1750. Minimum Length of String After Deleting Similar Ends

Med.
1751. Maximum Number of Events That Can Be Attended II

Hard
1763. Longest Nice Substring

Easy
1740. Find Distance in a Binary Tree

Med.
1741. Find Total Time Spent by Each Employee

Easy
1771. Maximize Palindrome Length From Subsequences

Hard
1799. Maximize Score After N Operations

Hard
1814. Count Nice Pairs in an Array

Med.
1802. Maximum Value at a Given Index in a Bounded Array

Med.
1789. Primary Department for Each Employee

Easy
1795. Rearrange Products Table

Easy
1822. Sign of the Product of an Array

Easy
1833. Maximum Ice Cream Bars

Med.
1859. Sorting the Sentence

Easy
1877. Minimize Maximum Pair Sum in Array

Med.
1863. Sum of All Subset XOR Totals

Easy
1864. Minimum Number of Swaps to Make the Binary String Alternating

Med.
1889. Minimum Space Wasted From Packaging

Hard
1884. Egg Drop With 2 Eggs and N Floors

Med.
1913. Maximum Product Difference Between Two Pairs

Easy
1901. Find a Peak Element II

Med.
2307. Check for Contradictions in Equations

Hard
1948. Delete Duplicate Folders in System

Hard
1952. Three Divisors

Easy
1994. The Number of Good Subsets

Hard
1984. Minimum Difference Between Highest and Lowest of K Scores

Easy
1986. Minimum Number of Work Sessions to Finish the Tasks

Med.
2006. Count Number of Pairs With Absolute Difference K

Easy
1978. Employees Whose Manager Left the Company

Easy
2024. Maximize the Confusion of an Exam

Med.
2012. Sum of Beauty in the Array

Med.
2016. Maximum Difference Between Increasing Elements

Easy
2039. The Time When the Network Becomes Idle

Med.
2029. Stone Game IX

Med.
2053. Kth Distinct String in an Array

Easy
2045. Second Minimum Time to Reach Destination

Hard
2073. Time Needed to Buy Tickets

Easy
2132. Stamping the Grid

Hard
2099. Find Subsequence of Length K With the Largest Sum

Easy
2091. Removing Minimum and Maximum From Array

Med.
2130. Maximum Twin Sum of a Linked List

Med.
2121. Intervals Between Identical Elements

Med.
2140. Solving Questions With Brainpower

Med.
2161. Partition Array According to Given Pivot

Med.
2183. Count Array Pairs Divisible by K

Hard
2258. Escape the Spreading Fire

Hard
2264. Largest 3-Same-Digit Number in String

Easy
2239. Find Closest Number to Zero

Easy
2246. Longest Path With Different Adjacent Characters

Hard
2236. Root Equals Sum of Children

Easy
2306. Naming a Company

Hard
2353. Design a Food Rating System

Med.
2360. Longest Cycle in a Graph

Hard
2389. Longest Subsequence With Limited Sum

Easy
2390. Removing Stars From a String

Med.
2401. Longest Nice Subarray

Med.
2405. Optimal Partition of String

Med.
2361. Minimum Costs Using the Train Line

Hard
2418. Sort the People

Easy
2522. Partition String Into Substrings With Values at Most K

Med.
2441. Largest Positive Integer That Exists With Its Negative

Easy
2423. Remove Letter To Equalize Frequency

Easy
2460. Apply Operations to an Array

Easy
2472. Maximum Number of Non-overlapping Palindrome Substrings

Hard
2466. Count Ways To Build Good Strings

Med.
2467. Most Profitable Path in a Tree

Med.
2483. Minimum Penalty for a Shop

Med.
2520. Count the Digits That Divide a Number

Easy
2581. Count Number of Possible Root Nodes

Hard
2589. Minimum Time to Complete All Tasks

Hard
2642. Design Graph With Shortest Path Calculator

Hard
2551. Put Marbles in Bags

Hard
2552. Count Increasing Quadruplets

Hard
2597. The Number of Beautiful Subsets

Med.
2563. Count the Number of Fair Pairs

Med.
2610. Convert an Array Into a 2D Array With Conditions

Med.
2621. Sleep

Easy
2628. JSON Deep Equal

Med.
2645. Minimum Additions to Make Valid String

Med.
2629. Function Composition

Easy
2633. Convert Object to JSON String

Med.
2636. Promise Pool

Med.
2707. Extra Characters in a String

Med.
2719. Count of Integers

Hard
2624. Snail Traversal

Med.
2626. Array Reduce Transformation

Easy
2622. Cache With Time Limit

Med.
2665. Counter II

Easy
2698. Find the Punishment Number of an Integer

Med.
2751. Robot Collisions

Hard
2722. Join Two Arrays by ID

Med.
2750. Ways to Split Array Into Good Subarrays

Med.
2765. Longest Alternating Subarray

Easy
2785. Sort Vowels in a String

Med.
2809. Minimum Time to Make Array Sum At Most x

Hard
2843. Count Symmetric Integers

Easy
2835. Minimum Operations to Form Subsequence With Target Sum

Hard
2896. Apply Operations to Make Two Strings Equal

Med.
2864. Maximum Odd Binary Number

Easy
2882. Drop Duplicate Rows

Easy
2997. Minimum Number of Operations to Make Array XOR Equal to K

Med.
3016. Minimum Number of Pushes to Type Word II

Med.
3098. Find the Sum of Subsequence Powers

Hard
3082. Find the Sum of the Power of All Subsequences

Hard
3075. Maximize Happiness of Selected Children

Med.
3128. Right Triangles

Med.
3121. Count the Number of Special Characters II

Med.
3152. Special Array II

Med.
3174. Clear Digits

Easy
3211. Generate Binary Strings Without Adjacent Zeros

Med.
3193. Count the Number of Inversions

Hard
3206. Alternating Groups I

Easy
3228. Maximum Number of Operations to Move Ones to the End

Med.
3233. Find the Count of Numbers Which Are Not Special

Med.